Patent US3242858A successfully refreshed from Google Patents.
US3242858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductography employing absorbed metal ions
Assignee: Eastman Kodak Co
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Filing: 1961-06-27
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Granted: 1966-03-29
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Donald R Eastman
- 👤 Raymond F Reithel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:57
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS FOR PRODUCING FROM A NEGATIVE TRANSPARENCY, POSITIVE PRINTS ON PAPER, IN WHICH PROCESS AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY IS PRODUCED IN A HYDROPHOBIC PHOTCONDUCTIVE LAYER, THE STEPS COMPRISING FORMING ON THE PHOTOCONDUCTIVE LAYER BY PASSING CURRENT THROUGH THE LAYER DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN AND BY THE PRESENCE OF A SOLUTION CONTAINING MAGNESIUM IONS, AN IMAGE COMPRISING MAGNESIUM HYDROXIDE, APPLYING TO THE DEPOSITED HYDROXIDE IMAGE A SOLUTION CONTAINING IONS OF A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, NICKEL AND IRON, TRANSFERRING THE METAL IONS BY PRESSURE FROM THE METAL HYDROXIDE IMAGE TO THE SURFACE OF A RECEIVING SHEET AND CONVERTING SAID IONS TO A MATERIAL HAVING OPTICAL DENSITY.
Claim 2
Dependent Claim
118 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS FOR PRODUCING FROM A NEGATIVE TRANSPARENCY, POSITIVE PRINTS ON PAPER, IN WHICH PROCESS AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY IS PRODUCED IN A HYDROPHOBIC PHOTCONDUCTIVE LAYER, THE STEPS COMPRISING FORMING ON THE PHOTOCONDUCTIVE LAYER BY PASSING CURRENT THROUGH THE LAYER DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN AND BY THE PRESENCE OF A SOLUTION CONTAINING MAGNESIUM IONS, AN IMAGE COMPRISING MAGNESIUM HYDROXIDE, APPLYING TO THE DEPOSITED HYDROXIDE IMAGE A SOLUTION CONTAINING IONS OF A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, NICKEL AND IRON, TRANSFERRING THE METAL IONS BY PRESSURE FROM THE METAL HYDROXIDE IMAGE TO THE SURFACE OF A RECEIVING SHEET AND CONVERTING SAID IONS TO A MATERIAL HAVING OPTICAL DENSITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |